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一、加拿大石棉山露天矿石棉山的矿体界限很清楚,为飞镖形,长2000英尺,宽175英尺,矿体将用露天开采的方法采至680英尺深。采矿起始于1650标高,位于选厂和服务设施以上250英尺的地方。在该处揭露矿体,最初废石剥离量最小。采坑的最终的尺寸(在最大和最宽点)为2300英尺长×1000英尺宽。为了降低生产成本和减少剥采比,对岩石结构进行了研究,结果表明,借助于预切爆破,可使边坡稳定性保持于60～70°的范围内。
First, the Canadian Shimianshan open-pit mine Shimianshan ore body boundaries are clear, for the dart-shaped, 2,000 feet long and 175 feet wide, the ore body will be opencast mining method to 680 feet deep. Mining starts at 1650 elevations, 250 feet above the mill and service facilities. At this site exposing the orebody, the amount of peel was initially minimized. The final size of the pit (at the maximum and widest points) is 2300 feet long by 1000 feet wide. In order to reduce the production cost and reduce the stripping ratio, the rock structure was studied. The results show that the slope stability can be kept in the range of 60-70 ° by means of precast cutting.